release: bump version to 0.49.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/location/pipeline.py

@@ -0,0 +1,126 @@
+"""Pipeline that runs a sequence of :class:`LocationResolver` instances."""
+
+from __future__ import annotations
+
+from typing import Protocol, Sequence
+
+from .models import (
+    LocationCandidate,
+    LocationQuery,
+    ResolutionDiagnostic,
+    ResolutionResult,
+    ResolverOutput,
+)
+
+
+class LocationResolver(Protocol):
+    """Pluggable location resolution step.
+
+    Implementations: ``SourceCoordinatesResolver``, ``RegistryResolver``,
+    ``NominatimResolver``, ``InheritFromAnotherEntityResolver`` — see the
+    ``resolvers`` subpackage. New algorithms (peeringdb / IXP / user-confirmed
+    coordinates) plug in by implementing this protocol; the pipeline does not
+    care how candidates are produced.
+    """
+
+    name: str
+
+    def resolve(self, query: LocationQuery) -> ResolverOutput: ...
+
+
+def default_candidate_sort_key(
+    candidate: LocationCandidate,
+) -> tuple[int, int, float]:
+    precision_rank = {"precise": 0, "site": 1, "city": 2}.get(
+        candidate.precision, 9
+    )
+    source_rank = {
+        "source_coordinates": 0,
+        "stored_compute_center_location": 1,
+        "stored_collector_location": 1,
+        "ror_organization_registry": 2,
+        "inherited": 3,
+        "nominatim_online_geocode": 4,
+        "local_registry": 8,
+        "local_registry_city": 9,
+    }.get(candidate.source, 9)
+    return (source_rank, precision_rank, -float(candidate.confidence or 0))
+
+
+class LocationPipeline:
+    """Orchestrate a sequence of resolvers.
+
+    ``collect_candidates`` runs every resolver and returns *all* deduped
+    candidates plus the queries each resolver attempted (useful for
+    user-facing "why didn't this work?" diagnostics).
+
+    ``resolve_best`` returns the top candidate per
+    :func:`default_candidate_sort_key` (or a custom sort).
+    """
+
+    def __init__(
+        self,
+        resolvers: Sequence[LocationResolver],
+        *,
+        sort_key=default_candidate_sort_key,
+        failure_reason: str = (
+            "Could not resolve to renderable coordinates from any configured resolver."
+        ),
+    ) -> None:
+        self._resolvers = list(resolvers)
+        self._sort_key = sort_key
+        self._failure_reason = failure_reason
+
+    @property
+    def resolvers(self) -> tuple[LocationResolver, ...]:
+        return tuple(self._resolvers)
+
+    def collect_candidates(
+        self, query: LocationQuery
+    ) -> tuple[list[LocationCandidate], list[str]]:
+        candidates: list[LocationCandidate] = []
+        attempted: list[str] = []
+        seen_keys: set[tuple[str, str, str]] = set()
+
+        for resolver in self._resolvers:
+            output = resolver.resolve(query)
+            for q in output.attempted_queries:
+                if q and q not in attempted:
+                    attempted.append(q)
+            for candidate in output.candidates:
+                key = (
+                    candidate.source,
+                    f"{candidate.latitude:.4f}",
+                    f"{candidate.longitude:.4f}",
+                )
+                if key in seen_keys:
+                    continue
+                seen_keys.add(key)
+                candidates.append(candidate)
+
+        candidates.sort(key=self._sort_key)
+        return candidates, attempted
+
+    def resolve_best(self, query: LocationQuery) -> ResolutionResult:
+        candidates, attempted = self.collect_candidates(query)
+        if candidates:
+            return ResolutionResult(
+                location=candidates[0],
+                diagnostic=None,
+                attempted_queries=tuple(attempted),
+            )
+        return ResolutionResult(
+            location=None,
+            diagnostic=ResolutionDiagnostic(
+                failure_reason=self._failure_reason,
+                attempted_queries=tuple(attempted),
+                name=query.name,
+                country=query.country,
+                city=query.city,
+                site=str(query.extra.get("site")) if query.extra.get("site") else None,
+                operator=str(query.extra.get("operator"))
+                if query.extra.get("operator")
+                else None,
+            ),
+            attempted_queries=tuple(attempted),
+        )